Words have a tremendous impact on us. Whatever words we utter should be chosen with care for people will hear them and be influenced by them for good or evil. The basic tool for the manipulation of truth is the manipulation of words. If one can control the meaning of words, one can control the people who use those words. Likewise, the basic tool for the preservation of truth is the preservation of God's words. If one understands the original meaning of God's words, we can more easily recognize those who try to manipulate and control others through deception and the altering of the original definitions of words.

Words have been re-defined. But upon closer examination, we find another astonishing truth. What has been done is that we have adopted the words of the world to describe us, instead of using the words of Christ to define us. Some claim that the words we speak arenít that important. But if itís not important, why does scripture prohibit "vain babblings" (1 Timothy 6:20, 2 Timothy 2:16), "evil communications" (1 Corinthians 15:33), and "filthy communication out of your mouth" (Colossians 3:8)?

Proverbs 12:18, "...the tongue of the wise is health."
As in the health of the body, a doctor can often assess our state of health by looking at our tongues; so too in the spiritual realm. James tells us that the way a man uses his tongue is a test of his spiritual strength (James 1:26). He also says that if a man can control his tongue he is a perfect man (James 3:2). Jeremiah was told by the Lord that he could be God's mouthpiece only if he was careful about the way he used his tongue - if he separated the precious from the vile in his conversation (Jeremiah 15:19). Therefore, we should be very careful about the words that we choose to speak.

1 Corinthians 2:12-13, "Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God. Which things also we speak, not in the words which man's wisdom teacheth, but which the Holy Ghost teacheth; comparing spiritual things with spiritual."
It is so very important, as the above passage states, to not speak the words that we have been conditioned to speak by the spirit of the world (by what man's wisdom has taught us); but to speak the words which the Holy Spirit has taught us (to speak in a spiritual manner). These words are contained in the Holy Scripture, which are for our "doctrine, for reproof, for correction, for instruction in righteousness" (2 Timothy 3:16).
More:
http://www.ecclesia.org/truth/words.html#Conclusion

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ď...I realized I had to gain more knowledge to protect against evil and to protect myself from not becoming evil myself. This is our major goal in life...\" Terry Lee